"Nobody knows," he wrote. "There are only two possibilities; either she was trying to get away from the argument, or she was trying to tie the dinghy. But the bottom line is that nobody knows exactly what happened."

Later in the book, Wagner wrote, "Did I blame myself? If I had been there, I could have done something. But I wasn't there. I didn't see her."

He wrote that he has never returned to Catalina Island.

Phone and email messages to Walken's publicist were not immediately returned. Attempts to contact Davern were unsuccessful.